[froggy]

I've seen a video where Spoon Sports did this for their race cars with excellent results. I don't remember, but it was either a Honda Fit, Civic Type-R, or S2000. Definitely interesting if nothing else.

[Neanderthal Racing]

there are no shortcuts. i swear i could sell some of you guys those x-ray glasses in the back of mad magazine.

here's my recipe for a chassis so stiff you'll swear off the viagra:
gt spec subframe brace set
gt spec ladder brace
gt spec fender braces
an 8 point or better yet, 12 point custom chromoly roll cage. weld it in, don't bolt it in. if youre willing to add 30 lbs for the stiffening it offers, do your cage like we did. we bypassed the floor completely and welded two 2"x2" tubular steel rails along the rocker panels. the upper chromoly cage is welded directly to them. search "nhra rules" for the layout or pm me. the next round will finish the cage with a top hope. it's going to be a pia to move the fuse box on the left side to accomodate the front support.

you can add some seam welding if you want but i'm not sure its necessary. whatever you do, don't count on that stuff.

[300hp@6000rpm]

Slightly offtopic....

I plan on using that stuff to "stiffen" my V-Limited.

[thrlskr]

Originally Posted by CGMDan

In regards to the foam, Back when I was involved on Miata.net people over there starte using it on the bottom frame rails with success. But that was back in the mid to late 90's.
So who knows.

Yup we miata.net-ers were using belco foam in 8lb variety. Worked very well!!

[mtskibum16]

Originally Posted by 300hp@6000rpm

Slightly offtopic....

I plan on using that stuff to "stiffen" my V-Limited.

That should work well. We use a similar product in the back of some of the body kit work we do at my dad's body shop. It helps crappy fiberglass kits that people buy from cracking so bad.

[Guest_1u53r]

I applied it to the hollow member on my 02WRX that goes along the top of the trunk between the strut towers. It made it sound deader but did nothing otherwise.

You have to be VERY careful how much of this you apply, as it's not without weight and it definitely has the ability to balloon body panels if you use too much. 300Z guys used to use this stuff to debateable results.